The Argentine coach says at this stage of the season he is unconcerned by the nature of victories, just as long as they keep on coming
The victory leaves Barca one point behind league leaders Atletico Madrid, who they meet on Wednesday in the second-leg of their Champions League quarter-final after the two sides played out a 1-1 draw at Camp Nou last week.
Martino believes that wins, not performances, are more important at this stage of the season.
“In a sense, I was expecting today's match to not play out like our previous ones,” he told reporters.
“For once, I'm going to focus 100 per cent on the result, not how we played.
"I don't want to make excuses. The feeling that I have is that in between the game this past Tuesday and the one next Wednesday this match against Betis snuck up on us.
"We needed to win in order to continue putting pressure on the leaders."
With the second-leg of their European tie to come next week and the games both domestically and on the continent coming thick and fast, Martino admitted that he had missed a chance to keep some of his players fresh.
"I wanted to rest some of the players ahead of Wednesday's game against Atletico if today's game had gone differently. It didn't play out that way," he added.
"I probably could have given more rest to some of the players who featured on Tuesday. Perhaps I didn't go far enough with the rotations."